greenplumn CXformSemiJoinAntiSemiJoinSwap 源码
greenplumn CXformSemiJoinAntiSemiJoinSwap 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformSemiJoinAntiSemiJoinSwap.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformSemiJoinAntiSemiJoinSwap.h
//
// @doc:
// Swap cascaded semi-join and anti semi-join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformSemiJoinAntiSemiJoinSwap_H
#define GPOPT_CXformSemiJoinAntiSemiJoinSwap_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftAntiSemiJoin.h"
#include "gpopt/operators/CLogicalLeftSemiJoin.h"
#include "gpopt/xforms/CXformJoinSwap.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformSemiJoinAntiSemiJoinSwap
//
// @doc:
// Swap cascaded semi-join and anti semi-join
//
//---------------------------------------------------------------------------
class CXformSemiJoinAntiSemiJoinSwap
: public CXformJoinSwap<CLogicalLeftSemiJoin, CLogicalLeftAntiSemiJoin>
{
private:
public:
CXformSemiJoinAntiSemiJoinSwap(const CXformSemiJoinAntiSemiJoinSwap &) =
delete;
// ctor
explicit CXformSemiJoinAntiSemiJoinSwap(CMemoryPool *mp)
: CXformJoinSwap<CLogicalLeftSemiJoin, CLogicalLeftAntiSemiJoin>(mp)
{
}
// dtor
~CXformSemiJoinAntiSemiJoinSwap() override = default;
// Compatibility function
BOOL
FCompatible(CXform::EXformId exfid) override
{
return ExfAntiSemiJoinSemiJoinSwap != exfid;
}
// ident accessors
EXformId
Exfid() const override
{
return ExfSemiJoinAntiSemiJoinSwap;
}
const CHAR *
SzId() const override
{
return "CXformSemiJoinAntiSemiJoinSwap";
}
}; // class CXformSemiJoinAntiSemiJoinSwap
} // namespace gpopt
#endif // !GPOPT_CXformSemiJoinAntiSemiJoinSwap_H
// EOF
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